Distortion on the Clean channel?

My Sons Peavey Blazer 158 amp has developed a fault. On the Clean channel you get significant distortion. All other aspects of the amp are fine. Is there a solution? Can I buy a replacement head for the amp? as it seems to me that the fault lies in the electronics of the head

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Well, the nice thing about the newer amps is that the actual amp
circuitry is all contained in a module and you don't have to do much
troubleshooting. Just replace the module for that pair of
channels. Bad news of course is the modules can be pricey.
Should say right on it the part number, order it from mcminone.com or
whoever, solder it in, use new conductive grease (many times I think
these modules fail because the grease gets old, the module overheats
and toasts) and you should be fixya'd

There is a defect in the pre-amp section of the unit. Without seeing it and taking a few measurements, I can't give you any particulars. A rough estimate for a repair wouldbe about $10-$25 in parts plus the local labor rate.

Usually this is caused by a cellphone in the area. The cellphones send a signal to the cell tower ever few seconds, when they do that, it makes it sound like the wireless mike is losing its battery, when in fact, it is the cellphone interfering with the signal. A simple test would be to power up the system when you can verify there are no cellphones turned on and try the wireless system. Then turn the cellphone on and repeat the scenario.

Phono inputs are designed for turntables only. Any other device will provide too high a signal for that input to handle. The phono input has an extra amplification stage built in. The distortion is because of the high suignal level being supplied to the input. The only way to get this to work properly is to purchase an antenuator which will decrease the signal level to the phono level.

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First of all confirm if the speaker impedance is not lower then the recommended Ohms at the back of the Mixer speaker socket.You can use an 8 Ohms speaker on a 4 Ohms amplifier but not vise versa .Next see if the fan on the mixer works. If not the Amp is getting very hot and this will lead to unwanted distortion. You can confirm if its a heat related issue by playing the mixer at low volumes for more than an hour and see if it distorts.

Yellow should be the positive. Try plugging in and reversing. The louder of the two is the one in phase and the correct wiring. If the speaker is pushing out when playing , it is in phase and correct also. The distortion problem could be a speaker going out. It may not be totally blown, but may be verging. Holding your hand out as wide as you can push against the speaker lightly. If there is a rubbing or scratching sound, the speaker could be damaged.If it moves freely, and there is no scratching its okay. Another possibility is the clean channel may have a channel volume set to high. Make sure the clean channel volume is set lower than the master volume otherwise you can get distortion on that channel too. Good Luck.

Resistors are good at causing distortion, you might spot one that has burned or broken. If the distortion is in both channels, which by what you say it is, then you might be looking for something common to both channels. Perhaps an IC.

initially you want to think bad solder joint, but it think its a bad mosfet or rectifier or diode. it would be hard for an untrained person to identify your problem let alone an experienced tech. it may be time to move on to another amp. in my shop it would be at least 65 bucks for the repair. so where did the "heat"/energy go from that point and what parts were affected. there may be a domino affect. burn one part, not usually. yostamplifier.com

Unless there is a 240/120 switch on the back, this amplifier cannot change voltage. The only way is to replace the power transformer, and when you do that you need to use the exact model transformer Peavey uses for the 120 version. I have also seen differences in handling power outside of just a different transformer for USA/Euro models.
The differences between these two market models might be beyond what is cost-effective to convert.

Start with a clean setting - zero cut and zero gain on the Eq.
Play a song close to the amp, and then move away, playing the same notes. Do you still get the distortion?
Change lower the input gain and repeat the test.
Lower the output gain and repeat.
Are any outboard distortion pedals in the mix, such as overdrive?
Eliminate them. Run straight through from your axe to the amp.
Check for any distortion settings. Set everything including reverb to zero. When the distortion disappears, this is your base setting.
Change only ONE parameter at a time. When the distortion comes back, you have found your problem.+